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Properties of the Number 21120

Twenty-One Thousand One Hundred Twenty

Basics

Value: 21119 → 21120 → 21121

Parity: even

Prime: No

Previous Prime: 21107

Next Prime: 21121

Digit Sum: 6

Digital Root: 6

Palindrome: No

Factorization: 2 7 × 3 × 5 × 11

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 11, 12

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101001010000000

Octal: 51200

Duodecimal: 10280

Hexadecimal: 5280

Square: 446054400

Square Root: 145.3272169966796

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Table of coefficients of polynomials related to the Dirichlet η function. A156919
Triangle read by rows: T(n,k) is the number of end rhyme patterns of a poem of an even number of lines (2n) with 1<=k<=n evenly rhymed sounds. A156289
Triangle of coefficients of Chebyshev's U(n,2·x-1) polynomials (exponents of·in decreasing order). A53125
Integers that are Rhonda numbers to base 18. A255735
Dates after Jan 01 00 in chronological order which are palindromic when they are written according to the format MMDDYY (American standard, short). Leading zeros of the terms are suppressed. A210895
Determinant of the n X n matrix whose element (i,j) equals the |i-j|-th prime or if i=j, 0. A71079
A transform of C(n,3). A82138
Sequence associated with recurrence a(n) = 2·a(n-1) + k*(k+2)*a(n-2). A80951
T(n,k)=3X3X3 triangular graph coloring a rectangular array: number of nXk 0..5 arrays where 0..5 label nodes of a graph with edges 0,1 0,2 1,2 1,3 1,4 2,4 3,4 2,5 4,5 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph. A223218
Negasemiternary (or NST) representation of n. A355904